During its annual BlizzCon event, Blizzard confirmed that most of StarCraft II's content will be available for free (but not all of it).

Starting November 14, PC gamers can download and play StarCraft II's launch Wings of Liberty campaign as well as a smattering of co-op and multiplayer content for free. Not everything will be available for the low cost of nothing--Heart of the Swarm, Legacy of the Void, and Nova Covert Ops campaigns will be sold separately for $14.99 a piece, or bundled for $39.99.

The original Wings of Liberty campaign. Experience the original epic campaign that kicked off the StarCraft II saga! If you picked up Wings of Liberty previously but haven't come back to StarCraft II in a while, we've got good news for you too-if you already own Wings of Liberty, you'll receive the second installment in StarCraft II's campaign, the zerg-focused Heart of the Swarm, for free. Make sure to log in between November 8 and December 8 to claim it.

You will be able to access the ranked multiplayer ladder to compete with other players to become the best of the best, complete with all of the multiplayer units from Wings of Liberty, Heart of the Swarm, and Legacy of the Void. All you have to do to unlock it permanently is earn 10 First Wins of the Day in Unranked or Versus A.I. play-our way to preserve the quality and integrity of the ranked experience.

Current and upcoming Co-op Commanders are available to play for free up to level five, and the level restriction for weekly mutations has been removed. You'll be able to tackle these extra challenging missions with your friends right away. The Co-op Commanders Raynor, Kerrigan, and Artanis will remain completely free, meaning that you can keep leveling them to your heart's content.

"In other words, you can now play all of StarCraft II's multiplayer, every Co-op Commander, and the entire first campaign in the single-player story, for free."